Top Telecom Security Interview Questions :: Top Telecom Security Interview Questions en-us 1)what is cdma technology? 2)how can cdma work? 3)history of cdma? Short for Code-Division Multiple Access, a digital cellular technology that uses spread-spectrum techniques. CDMA is a military technology first used during World War II by English allies to foil German attempts at jamming transmissions. The Why is VLAN trunking a security risk? while physical separation between network segments,VLAN rely on switching should be perfect, if not so,misconfiguration or a bug could cause the VLAN barriers to be broken There i a 2 risk 1.packet leaks from one VLAN to another, possibly r how to do testing in webnms(network management system) NMS is a GUI(Graphical user interface) device by using SNMP protocal you remotely monitor/config/operate the device. By NMS u have full control of remote device 7 u do testing/config/updation/status.....of remote device